this post was submitted on 08 Nov 2023
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So to clarify, the M2 Ultra runs at 800 GB/s because it's utilizing multiple memory channels, which is like running dual/quad/etc. channel RAM in an x86 PC. So at the max 64 GB/s bandwidth of DDR5 ram, you could run quad channel and get 256 GB/s right? And getting up to 12 channels of DDR5 could mean a bandwidth of 768 GB/sec?
Yeah, in that case Apple is definitely over charging. To be fair, my mb can't run 12 channels of RAM but it also won't cost me an arm and a leg and a kidney to have similar performance per GB
Note that I can't think of modem four channel x86. Either they are the usual two channel (two dimms per channel is how four dimm slots are organized) or have way more (Sapphire Rapids, Bergamo)
To map the M2, the base is about the same as most x86 consumer grade, the Pro is about Threadripper, and the ultra is somewhere between single or dual socket Bergamo, at least in terms of memory bandwidth, which is a highly specific metric.
Oh gotcha, thanks for straightening me out on that. I'm still learning tech so the examples are really helpful